COMMITMENTS AND CONTINGENCIES (Details) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2018 USD ($) Defendant	Dec. 31, 2015 Subsidiary
Arezzo Revenue Agency [Member]
Loss Contingencies [Line Items]
Estimated liability	$ 12.0
Setec [Member]
Loss Contingencies [Line Items]
Number of subsidiaries named in the lawsuit | Subsidiary		3
DG Yu Shing Industrial Development Company Limited [Member] | Dongguan Transpower [Member]
Loss Contingencies [Line Items]
Damges sought	$ 3.2
Number of defendants | Defendant	3